|Publication number||US7322349 B2|
|Application number||US 10/465,023|
|Publication date||Jan 29, 2008|
|Filing date||Jun 18, 2003|
|Priority date||May 5, 2000|
|Also published as||CA2409722A1, CA2409722C, CA2653847A1, CA2653847C, DE60131156D1, DE60131156T2, EP1278569A1, EP1278569B1, US6615824, US20020002975, US20040035490, US20080149096, WO2001085244A1|
|Publication number||10465023, 465023, US 7322349 B2, US 7322349B2, US-B2-7322349, US7322349 B2, US7322349B2|
|Inventors||John S. Power|
|Original Assignee||Aerogen, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (144), Non-Patent Citations (31), Referenced by (19), Classifications (13), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a divisional of Ser. No. 09/849,194 U.S. Pat. No. 6,615,824 filed May 4, 2001, which claims priority from PCT/IE/00051 filed on May 5, 2000, the complete disclosures of both of which are incorporated herein by reference.
This invention relates to methods and apparatus for delivery of medicament to the respiratory system of a patient. In particular, the invention relates to apparatus and methods of this type for use in association with a nebulizer.
It is known to use a nebulizer to create an aerosol of medication for delivery into the respiratory system of a patient. Typically the medication is placed in a cup which is held over a reservoir of buffer water. A piezoelectric element is vibrated ultrasonically under the buffer water transferring energy to the water, thus causing an aerosol to be formed in the medication cup. Baffles are provided between the medication cup and the airway in an attempt to ensure large particles of medication rain out on the filter and drip back down into the medication cup.
These nebulizers suffer from a number of disadvantages. In particular, medications have a range of different viscosities, however particle generation is not consistent across the range. Thus the medication particle size is not accurately controlled and a broad range of particles pass into the patient airway. Nebulized medication which rains out on the filter drips back into the cup only to be nebulized again. This may degrade or destroy the medication.
The medication in the cup is directly exposed to the airway. Therefore the nebulizer must be maintained substantially horizontal at all times to prevent medication spilling out into the patient airway. Also the ventilator pressure will be lost when the medication cup is removed to refill it.
This method of aerosol generation requires a relatively large amount of energy, the response time of aerosol generation is thus large. A considerable amount of heat is generated during use of the nebulizer, therefore to prevent patient discomfort or injury the nebulizer is placed away from the patient. However this necessitates a long inhalation tube between the nebulizer and the patient, increasing drug loss through rain out along the inhalation tube, and further increasing the response time to patient inspiration. Further, the generated heat degenerates the medication, which can be particularly harmful to protein based drugs.
Hence, this invention is related to apparatus and techniques for delivery of medicament to the respiratory system of a patient.
In one embodiment, an apparatus for delivery of medicament to the respiratory system comprises a reservoir, such as a medication cup, for receiving a liquid medication that is to be delivered to a respiratory system. The apparatus also includes an aerosol generator that may be held within a housing. A liquid supplier is provided to deliver the liquid medicament from the cup to the aerosol generator. A connector is employed to receive aerosol generated by the aerosol generator. The connector has an aerosol inlet for receiving aerosol from the generator, an air inlet, and an outlet. In this way, the aerosol that is received through the aerosol inlet may be entrained with a gas passing through the air inlet, and the entrained aerosol may pass through the outlet for delivery to a patient. Conveniently, the connector may be coupled to a ventilator to introduce the gas into the air inlet.
In one aspect, the connector is of generally T-shape and has an inlet leg with a longitudinal axis and an outlet leg with an air inlet end and an aerosol outlet end. The inlet is connected to the outlet leg intermediate the air inlet end and the aerosol outlet end, and the outlet leg has a first portion extending from the air inlet end to the connection to the inlet leg. The first portion has a longitudinal axis, with the longitudinal axis of the inlet leg subtending an angle of less than 90° with the longitudinal axis of the first portion of the outlet leg. Preferably the angle between the longitudinal axis of the first portion of the outlet leg and the longitudinal axis of the inlet leg is less than 80°. Ideally the angle between the longitudinal axis of the first portion of the outlet leg and the longitudinal axis of the inlet leg is about 75°. In some cases, the outlet leg may have a second portion extending from the first portion, the second portion being substantially in line with the first portion.
Conveniently, the connector may also be defined in terms of a gas conduit having an inlet, and an outlet, and an aerosol supply conduit. With such a configuration, the aerosol generator is configured to provide the aerosolized liquid medicament into the gas conduit through the aerosol supply conduit, and the gas conduit is adapted to pass gases to entrain the aerosolized liquid medicament.
In another embodiment of the invention, the medication cup is releasably mounted to the aerosol generator housing. In one aspect, the medication cup has a reservoir for holding a medication and a delivery tube having an inlet for receiving medication from the reservoir. The delivery tube is associated with the liquid supplier to deliver the liquid medication to the aerosol generator. The inlet may comprise a number of inlet slots which are circumferentially spaced-apart around the delivery tube.
The aerosol generator housing and the medication cup may be configured to be sealed to each other. This may be accomplished using a sealing mechanism, such as a skirt extending from the aerosol generator housing to sealingly engage the medication cup. Conveniently, the skirt may have an angled surface to sealingly engage a chamfered mouth of the medication cup. In a further aspect, the liquid supplier may be mounted to the aerosol generator housing.
In a further embodiment, the medication cup has a base with support for supporting the cup in an upright orientation when receiving liquid medication. The support may comprise a support skirt extending from the base of the cup. Conveniently, the medication cup may include a central well from which the delivery tube extends.
In one embodiment, the apparatus includes controller for controlling the operation of the aerosol generator. For example, the controller may send control signals to actuate the aerosol generator just prior to initiating an inhalation cycle of a ventilator and to deactivate the aerosol generator just after termination of the inhalation cycle of the ventilator. Conveniently, the controller may be the same controller used to control the ventilator. In one aspect, the aerosol generator housing has a signal connector to which a control signal from the controller is inputted to control the operation of the aerosol generator. An interface may also be used to interface the aerosol generator with the controller. The interface may be mounted remote from the aerosol generator housing.
In another aspect, the liquid supplier is mounted to the aerosol generator housing. In this way, the liquid supplier and the aerosol generator are configured as a single unit. In a further aspect, the medication cup may be releasably mounted to the aerosol generator housing. As such, the medication cup may easily be removed when refilling and/or replacement is needed.
According to another embodiment of the invention, a connector is provided for delivery of medicament to the respiratory system. The connector comprises a generally T-shaped device having an inlet leg with a longitudinal axis and an outlet leg with an air inlet end and an aerosol outlet end. The inlet leg is connected to the outlet leg intermediate the air inlet end and the aerosol outlet end. The outlet leg has a first portion extending from the air inlet end to the connection to the inlet leg. The first portion has a longitudinal axis subtending at an angle of less than 90° with the longitudinal axis of the inlet leg.
In one aspect, the angle between the longitudinal axis of the first portion of the outlet leg and the longitudinal axis of the inlet leg is less than 80°. Ideally, the angle between the longitudinal axis of the first portion of the outlet leg and the longitudinal axis of the inlet leg is about 75°. The outlet leg may have a second portion extending from the first portion, with the second portion being substantially in line with the first portion.
In another embodiment, the invention provides a medication cup for receiving liquid medication for delivery to an aerosol generator. The medication cup has a reservoir for holding a medication and connector for connection to an aerosol generator. The medication cup has a releasable seal for maintaining the medication in the cup.
In one embodiment of the invention, the releasable seal comprises a sealing sheet releasably attached to the cup. Conveniently, a peel tab or other release mechanism may be used to remove the sheet. Alternatively the release mechanism may be a tab or other opener to perforate the sealing sheet when the cup is connected to the aerosol generator. The sheet may conveniently have an identifying code.
The invention further provides a nebulizer system for use with a ventilator circuit. The system comprises at least one tubing section having an inlet and an outlet for delivering air or other gases to a patient from a ventilator. The system further includes a nebulizer which delivers a nebulized fluid to the tubing section for inhalation by a patient on the ventilator. The nebulizer has a vibrating element having a front side, a back side and a plurality of openings. A fluid delivery system is employed to deliver fluid to the back side of the vibrating element. With this configuration, vibration of the vibrating element moves fluid from the back side of the vibrating element through the plurality of openings to produce the nebulized fluid which enters the tubing section for delivery to the patient.
In one aspect, the tubing section forms an air path and the source of fluid is separated from the air path by the vibrating element. In another aspect, the tubing section includes a T-shaped section. Conveniently, the source of fluid may include a capillary feed system which provides fluid to the back side of the vibrating element, and the vibrating element may comprise a ring-shaped piezoelectric element. The openings in the vibrating element may be sized to eject liquid droplets such that about 70% or more of the droplets by weight have a size in the range from about 1-5 micrometers.
In a further embodiment, a nebulizing device comprises a nebulizing element, and a fluid delivery system to deliver a fluid to the nebulizing element. At least one tube section is employed to define a delivery path to the patient. This delivery path is conveniently defined by a distance between the nebulizing element and the patient, and has a length of less than 500 mm, and preferably less than about 300 mm.
In one aspect, the nebulizing element has a vibrating element with openings therein. The vibrating element also has a front side and a back side, and the delivery path is defined at one end by the front side of the vibrating element. With this configuration, the fluid is delivered through the openings in the vibrating element upon vibration of the vibrating element, with the fluid being delivered to the back side of the vibrating element.
In another aspect, the tube section includes a T-shaped section having a top section and a central section, and the nebulizing element is positioned at a bottom of a central section. Ideally, the central section forms an angle of from 60° to 80° with a straight portion of the T-shaped section. In a further aspect, the tube section may include a Y-shaped section which separates into a first arm for inhalation and a second arm for exhalation. With this arrangement, the nebulizing element is coupled to a second tube section which is connected to the Y-section. Desirably, the second tube section is a T-shaped section which is attached to the Y-section. Preferably, the delivery path through the tube section is substantially free of baffles and flow disrupters.
The invention also provides a method of providing a nebulized fluid to a patient. According to the method, a vibratable member having a plurality of apertures that is in contact with a fluid is vibrated to produce a nebulized fluid. The nebulized fluid is permitted to eject into a conduit that is coupled to a ventilator. A gas from the ventilator is then employed to supply the aerosolized fluid to the patient's airway. Alternatively, the nebulized fluid may be provided to the patient using other techniques, such as by patient inhalation.
In one aspect, the distance between the vibratable member and the patient is less than about 500 mm, and in some cases less than about 300 mm. In this way, minimal tubing may be used to supply the aerosolized fluid to the patient, thereby requiring less energy to nebulize the fluid and reducing the generated heat so that the medication is not compromised.
The invention further provides a ventilator circuit that comprises a nebulizing element, and a fluid delivery system for delivering fluid to the nebulizing element. A ventilator is used to deliver and withdraw air from a patient. A control system is operably coupled to the nebulizing element and the ventilator. The control system is used to activate the nebulizing element during an inhalation cycle where respiratory gases are being supplied to the patient by the ventilator. For example, the controller may activate the nebulizing element within about 20 milliseconds of initiation of an inhalation cycle and deactivate the nebulizing element within 20 milliseconds of termination of the inhalation cycle. In this way, the aerosol is generated essentially only when gases are being supplied to the patient.
In one aspect, the nebulizing element has a vibrating element with openings therein, and a front side and a back side. The fluid is delivered through the openings in the vibrating element upon vibration of the vibrating element, and the fluid is provided to the back side of the vibrating element.
The invention will be more clearly understood from the following description of some embodiments thereof, given by way of example only, with reference to the accompanying drawings, in which:
Referring to the drawings and initially to
Liquid medication placed within the medication cup 2 is delivered up through the liquid supplier 5 by capillary action. An oscillatory motion of the liquid supplier 5 may also assist in pumping the liquid medication upwards. An aerosol of the medication is generated by the aerosol generator 3, the aerosol then passes through the aerosol generator housing 4 and into the connector 6. A gas, such as air or oxygen, enters the connector 6 through a gas inlet 61 of the connector 6 entraining the generated aerosol therein, and the air with entrained aerosol medication is delivered through an outlet 62.
A controller 50, which may be connected to the apparatus 1 by means of a control lead 52, controls the generation of the aerosol and the associated oscillation of the liquid supplier 5 (
Referring now to
The connector 6 is configured to entrain the aerosol generated by the aerosol generator 3, which passes from the aerosol generator housing 4 into the aerosol inlet 60, with a gas, such as air, which passes in through the gas inlet 61. The entrained medication aerosol/gas mixture passes out of the connector through the outlet 62.
The configuration of the connector 6 ensures the entrained aerosol/gas mixture passes out of the connector 6 through the outlet 62 regardless of the orientation of the connector 6, as illustrated in
It will be appreciated that the angle between the longitudinal axis of the gas inlet 61 and the longitudinal axis of the aerosol inlet 60 may be any angle in the range of from 60° to 90°, but preferably less than 90°, and most preferably from 60° to 80°.
The gas inlet 61 may be connected to a ventilator 70 which pumps a gas, such as air into the connector 6. Alternatively, the apparatus 1 may be employed during manual breathing with the gas inlet 61 being open to atmosphere.
The medication cup 2, as illustrated in
In this case, the tube 10 is integral with the cup 2. However, it will be appreciated that the tube 10 may alternatively be releasably attached to the cup 2.
A plurality of protuberances 14 are formed on the inner wall of the medication cup 2 to indicate the maximum volume of liquid medication to be inserted into the cup 2. In this case the maximum volume is about 10 ml, although other volumes may be used.
The medication cup 2 has an annular skirt 15, as illustrated in
A screw thread 16 projects outwardly from the upright sides 18 of the cup 2 to enable releasable mounting of the medication cup 2 with the aerosol generator housing 4. The upright sides 18 have a chamfered edge 99 at the mouth of the cup 2.
The medication cup 2 may be provided with a sealing sheet 19 to maintain the liquid medication in the cup 2 (
Information regarding, for example, the type of medication contained within the medication cup 2 or suitable dosages, or periods in which to use the medication may be provided on the sealing sheet 19. The information may be, for example, printed onto the sheet 19, or affixed with a label. The information may be, for example, in bar code format.
Referring now to
An annular sealing skirt 34 is formed on the shoulder part 31 extending downwardly. The skirt 34 is angled to sealingly engage the chamfered edge 99 of the mouth of the medication cup 2 in a wedge-seal arrangement, when the apparatus 1 is assembled (
A screw thread 35 is formed on the inner sides of the shoulder part 31 to enable releasable mounting of the medication cup 2 to the aerosol generator housing 4. The neck 30 has an annular inward projection 36 formed above the shoulder part 31. The projection 36 defines a space 37 within the hollow neck 30, in which the aerosol generator 3 may be received.
The housing 4 also includes a connector port 38 rigidly attached to the upper surface of the shoulder part 31. Port 38 is configured to receive a docking member 51 of the control lead 52. A control signal from the controller circuit 50 is passed through the control lead 52 into the housing 4 via the port 38 to control the operation of the aerosol generator 3 and thus the generation of aerosol of medication.
The liquid supplier 5 comprises a head 20 and a stub 21 separated by an annular protruding flange 26. A coiled spring 22 is coaxially mounted around the stub 21. The outer diameter of the stub 21 is less than the inside diameter of the delivery tube 10, so that there is a clearance between the stub 21 and the tube 10 when the stub 21 is inserted into the tube 10 in the assembled apparatus 1 (
The liquid supplier 5 includes two capillaries 23 which extend from the base 25 upwardly through the liquid supplier 5 to crown 24 of the head 20. The capillaries are open at the base 25 and at the crown 24 (
The aerosol generator 3 comprises a non-planar member 40, which may be dome shaped in geometry, with a plurality of tapered apertures extending between a front surface and a rear surface thereof, as described in U.S. Pat. No. 5,164,740 (Ivri), U.S. Pat. No. 5,586,550 (Ivri et al), U.S. Pat. No. 5,758,637 (Ivri et al), and U.S. Pat. No. 6,085,740 (Ivri et al), the entire contents of which are incorporated herein by reference. The aerosol generator 3 further comprises a piezoelectric element 42 having a central opening and a housing 44 (
The non-planar member 40 has a plurality of small holes through which small particles of medication pass and are ejected to form the aerosol of medication. An antibacterial coating may be applied to the member 40 to ensure a sterile aerosol flow of particles into neck 30.
The connector 6 may be releasably mounted to the housing 4 by means of a push-fit engagement between the aerosol inlet 60 and the neck 30 (
To assemble the apparatus 1, the aerosol generator 3 is assembled and is inserted into the neck space 37 within a sleeve 45 between an O-ring seal 46 and the shield 41, which is bonded to the housing 4. The aerosol generator 3 has freedom to move between the O-ring 46 and the shield 41. The liquid supplier 5 is engaged with the housing 4 by means of the snap-fit of the projections 33 with the flange 26. Liquid medication is then poured into the reservoir 11 and the housing 4 is mated with the medication cup 2, the stub 21 being inserted into the delivery tube 10. The housing 4 and the cup 2 are rotated relative to one another to inter-engage the screw threads 35, 16 and thereby seal the housing 4 to the medication cup 2. Finally, the aerosol inlet 60 is pushed over the neck 30 to mount the connector 6 in a push-fit arrangement.
As illustrated in
In the assembled apparatus of
In use and referring particularly to
The droplets of liquid emerge from the capillaries 23 at the crown 24 where they contact the non-planar member 40, the vibration of which causes the liquid to pass through the holes in the member 40 and generates an aerosol of medication. The aerosol passes through the neck 30 (flow B) into the aerosol inlet 60 until it meets the flow of gas from the gas inlet 61. The aerosol is entrained with the gas (flow C) and passes out of the connector 6 through the outlet 62 (flow D).
As illustrated in
The configuration of the T-shaped connector 6 means that an entrained mixture of aerosol medicament and gas is delivered from the connector outlet 62 through the inlet arm 101 to the face mask 100 and on to the respiratory system of the patient, in a wide variety of orientations of the apparatus 1, as illustrated in
The apparatus 1 is lightweight. By mounting the apparatus 1 to a face mask 100 which may be worn by a patient, the apparatus 1 may be used during movement of the patient. During such movement the apparatus 1 is supported by the face mask 100 due to the interference fit between the inlet arm 101 and the female connection recess 110, and the face mask 100 is in turn held in place on the patient by means of straps 102.
A breathing mouthpiece 120 may be used as an alternative to the face mask 100, as illustrated in
As a further alternative, a tracheal tube 130 may be used to assist breathing of a patient (
The apparatus 1 delivers an entrained aerosol medicament and gas mixture out through the outlet 62 regardless of the orientation of the apparatus 1. As illustrated in
An insert aperture 400 may be provided in the base 12 of the medication cup 2, as illustrated in
After delivery of medicament from the insert to the reservoir 11, the insert is normally removed and a plug is inserted into the aperture 400 to seal the reservoir 11.
A ventilator 200 may be connected to the gas inlet 61 of the connector 6 by means of an interference fit between a ventilator tube and the gas inlet 61. The connector 6 tapers outwardly near the gas inlet 61 to define a male connection protrusion 300 (
A Y-shaped connector piece may be provided in the ventilator tubing circuitry to provide one flow path for inhalation and an alternative flow path for exhalation. The Y-piece may be connected to the tubing circuitry either side of the apparatus 1.
Alternatively, the gas inlet 61 may be left open to atmosphere, in which case the patient breathes in through the connector 6 in the normal manner. In each case, the generated aerosol medicament is entrained with a gas, and the entrained mixture passes into the respiratory system of the patient through outlet 62.
The controller circuit 50 may be powered by an on-board power source, such as a rechargeable battery 201. Alternatively the controller circuit 50 may be connected to a remote power source by means of a power connection lead connected to the controller circuit 50 at power supply socket 53 (
The controller circuit 50 preferably includes an on/off switch 54 to selectively control the operation of the aerosol generator 3, and two light emitting diodes (LED's) 55, 56. One LED 55 indicates the aerosol generator 3 is in an active state generating aerosol of medicament, and the other LED 56 indicates that the aerosol generator 3 is in a rest state. The switch 54 may alternatively be a reset switch.
Timing circuitry may further be provided as part of the controller circuit 50 to automatically switch between the active state of operation of the aerosol generator 3 and the rest state. The timing sequence may be programmable to activate generation of the aerosol a short period after commencement of an inhalation cycle, and to cease generation of the aerosol a short period after commencement of an exhalation cycle. In this way, phasic delivery may be precisely timed with aerosol generation.
Referring now to
In the arrangement of
In the arrangement of
In the arrangement of
In the case where the power source is provided by the battery 201, and the gas inlet 61 is open to the atmosphere 204, the apparatus 1 is highly mobile. In particular, the apparatus 1 may be worn or held by the patient as the patient takes exercise.
Referring now to
The hook means is configured to define a plurality of, in this case four, support surfaces 252 for supporting the medical device in an upright configuration. The support surfaces 252 are provided by a lip 253 protruding from a main body 254 of the mounting device 250. The lip 253 is spaced from the main body 254 by two legs 255 (
In this case, the mounting device 250 is used to support the controller circuit 50, as illustrated in
The lip 253 comprises a plurality of support surfaces 252. This is advantageous, as it enables the controller circuit 50, or any other suitable medical device, to be supported in an upright orientation when the mounting device 250 is clamped to a horizontal support, such as a medi-rail (
Referring now to
In this case, the hook means may be moved relative to the attachment means to selectively disassociate the hook means from the attachment means, which is provided in this case by a sleeve 270. The sleeve 270 defines a groove 271 in which the main body 254 of the mounting device may be slidably received (
The sleeve 270 may be permanently or temporarily attached to a support, such as a medi-rail, or an IV pole, or a ventilator 200, as illustrated in
In one embodiment, the apparatus is provided as part of a ventilator circuit. In this case the ventilator circuit comprises a nebulizing element, a fluid source coupled to the nebulizing element for delivering fluid to the nebulizing element, and a ventilator which delivers and withdraws air from a patient. A control system is operably coupled to the nebulizing element and the ventilator. The control system activates the nebulizing element shortly before initiation of an inhalation cycle, for example within a time period such as 20 milliseconds and deactivates the nebulizing element shortly after termination of the inhalation cycle, for example within a time period such as 20 milliseconds. In this way, the aerosol is generated essentially only when the ventilator delivers a gas to the patient, thereby precisely controlling phasic delivery of a medication.
The apparatus will deliver medication in aerosol form to a patient in a wide variety of orientations of the apparatus. This is highly desirable as the apparatus may be directly attached to a patient breathing circuit and so reduce the length of tubing from the nebulizer to the mouth of the patient to less than 500 mm, usually less than 300 mm.
The apparatus provides a medication cup which is releasable from the aerosol generator housing. This is a highly efficient arrangement. When the liquid medicament has all been delivered to a patient respiratory system, the empty medication cup can be refilled with medicament, or can be replaced with a new cap full of medication in a quick and simple step. In this manner the apparatus may be reused many times.
The power usage of the apparatus is relatively low, in this case approximately 1.5 W, thus the associated heat generated during use is negligible. The apparatus may be placed as close to the patient as desired, even touching the patient for long periods of use without causing discomfort to the patient, or without burning the patient.
The coiled spring is mounted to the liquid supplier, the medication cup is therefore free of all moving parts. The medication cup may simply be replaced as a refill container when the liquid medication has been used.
The liquid supplier, is held within the aerosol generator housing. Therefore, there are no loose parts which could be contaminated, broken or lost during refill of the medication cup, or replacement of the medication cup.
The aerosol generator produces an aerosol of medication within a controlled range of aerosol particle sizes. No degradation of the medication occurs as a result of the aerosol generation process.
The invention is not limited to the embodiments hereinbefore described which may be varied in construction and detail.
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|U.S. Classification||128/200.14, 128/200.21, 239/338, 128/200.16|
|International Classification||A61M11/00, A61M15/00, A61M16/00, A61M16/08|
|Cooperative Classification||A61M15/0085, A61M16/08, A61M2209/082|
|European Classification||A61M15/00F, A61M16/08|
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Owner name: NOVARTIS PHARMA AG, SWITZERLAND
Free format text: ASSIGNMENT OF PATENT RIGHTS;ASSIGNOR:AEROGEN, INC.;REEL/FRAME:022062/0905
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Owner name: NOVARTIS PHARMA AG,SWITZERLAND
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